Inline 3.12 switch g++/gcc

Please help!
I'm use ruby 1.93 with inline 3.12, mingw, windows7 and when i run
following code i get an error message:

require 'inline'
class MyTest
  inline(:C) do |builder|
    builder.include '<iostream>'
    builder.add_compile_flags '-x c++', '-lstdc++'
    builder.c '
      void hello() {
          std::cout << "hello" << std::endl;
      }'
  end
end
t = MyTest.new()
t.hello

That's because by default ruby(or inline gem) use gcc.exe. But if I
rename g++ to gcc then no any errors.
  So please tell me, how can i quickly switch between g++ and gcc with
ruby config?

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